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Effects of Mycosphaerella leaf disease on the spectral reflectance of juvenile Eucalyptus globulus foliage

journal contribution
posted on 2023-05-16, 17:55 authored by Pietrzykowski, E, Stone, C, Elizabeth Pinkard, Caroline MohammedCaroline Mohammed
Mycosphaerella leaf disease (MLD) can cause significant discoloration, necrosis and defoliation in commercial plantations of young Eucalyptus globulus. This study investigated the spectral reflectance changes that result in E. globulus foliage from Mycosphaerella infection. Spectral reflectance measurements were made on healthy and infected E. globulus foliage in the visible and near-infrared wavelengths (400-1000 nm). Reflectance (R) at 760 nm produced the largest difference between the extremes of disease severity classes. The wavelength most sensitive to infection severity was R678 nm. Other sensitive wavelengths were located between 480 and 500 nm. The wavelengths near 708 and 550 nm appeared relatively insensitive to infection severity. The reflectance index best correlated to leaf infection was R678/R550 (r = 0.841, p < 0.0001). This index was used in a linear regression model for successfully predicting leaf infection levels from an independent data set (r = 0.95, p < 0.0001). © 2006 The Authors.

History

Publication title

Forest Pathology

Volume

36

Issue

5

Pagination

334-348

ISSN

1437-4781

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Blackwell Verlag GmbH

Place of publication

Germany

Repository Status

  • Restricted

Socio-economic Objectives

Other plant production and plant primary products not elsewhere classified

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